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<h2>Discussion</h2>
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This subclass implements the abbreviated form of the UPC symbol, the UPC-E which reduces the 12 characters
of the UPC-A down to 8 (six characters, check digit encoded in parity of other digits). It is a subclass of
NKDUPCABarcode beccause UPC-E does not have it's own check digit algorithm, rather the UPC-A check digit
(calculated on all 12 digits of the original value) and number system are encoded in the parity order of
the other six digits.
 <hr><br><p>(Last Updated 4/21/2003)
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